<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="" autocomplete="off" id="a">
        <!-- autofocus 自动获取焦点  input select textarea button-->
        <input type="password" autofocus required>

        <!-- placeholder 输入的提示文本  input textarea-->
         <input type="text" placeholder="请输入姓名" required>

         <!-- required 必须填 input textarea-->
         <input type="checkbox" required>

         <!-- max min step 具有数字性质的表单使用 -->
          <input type="number" max="100" min="0" step="5">
          <input type="range">

          <!-- autocomplete 表单的缓存 form 所有表单标签-->

          <!-- list  multiple -->
         <input type="submit">

         <!-- 按钮介绍  -->
         <input type="button">
         <button>按钮</button>
         <input type="image" src="./img/0.jpg">

    </form>

    <!-- form 设置表单控件的归属 -->
    <input type="text" form="a">
</body>
</html>